Gradation Variability of Asphalt Mixture in Construction Process

The construction process of asphalt pavement is complex and interrelated. The existing specifications are not strict in the gradation control during construction process and have poor pertinence, which results in difficulty to achieve an effective control. To solve these problems, this paper proposed the ratio corrected coefficient of variation for original aggregates to evaluate the variability of aggregates based on the practical project. At the same time, the gradation of asphalt mixture in the whole construction process was analyzed by means of tracking observation. The results show that the index can well-characterize the variability of aggregates. The most sensitive process of variability and the gradation change in the continuous construction process were obtained. It was suggested that the sensitive process should be taken as the control focus in the follow-up construction.